Mobile concrete station

ABSTRACT

A mobile or movable concrete station consists of several separate interconnectable units including an aggregate weighing unit, a cement silo unit, a belt conveyor unit and a concrete mixer unit with a cement scale vessel arranged in connection to the discharge end of the aggregate weighing unit for adding weighed cement to the aggregate material at the starting end of the conveyor unit which is adapted to connect the aggregate weighing unit with the concrete mixer unit. Each of the units in the concrete station is mounted on one or more wheeled carriages so that each unit individually or coupled in pairs can be moved by means of a traction vehicle or by railway.

United States Patent [191 Bostriim et al.

[ 1 June 28, 1974 1 MOBILE CONCRETE STATION [75] Inventors: StureBostriim, Umea; Gert Nordstrom, Sormjole, both of Sweden [73] Assignee:Robacks Medaniska Verkstad Bostrom & Soner, Umea, Sweden [22] Filed:June 20, 1972 [21] Appl. No.: 264,651

[30] Foreign Application Priority Data June 23, 1971 Sweden 8213/71 [52]US. Cl 259/154, 259/159 A, 259/160, 259/ 161 [51] Int. Cl B011 5/42 [58]Field of Search 259/154, 159 A, 160, 176, 259/177,183,l53, 161,162,163

[56] References Cited UNITED STATES PATENTS 2,344,228 3/1944 Barber259/159 A X Paulus et al. 259/159 A X Ross et a], 259/154 X 5 7]ABSTRACT A mobile or movable concrete station consists of severalseparate interconnectable units including an aggregate weighing unit, acement silo unit, a belt conveyor unit and a concrete mixer unit with acement scale vessel arranged in connection to the discharge end of theaggregate weighing unit for adding weighed cement to the aggregatematerial at the starting end of the conveyor unit which is adapted toconnect the aggregate weighing unit with the concrete mixer unit. Eachof the units in the concrete station is mounted on one or more wheeledcarriages so that each unit individually or coupled in pairs can bemoved by means of a traction vehicle or by railway.

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MOBILE CONCRETE STATION This invention relates to a concrete mixingstation or concrete station and, more precisely, to a mobile or movablesuch station, which is composed of several separate units comprisingthose functions which are necessary for concrete mixing, for exampleweighing and charging of aggregates and cement, addition of water in aproportion determined according to the mixing prescription used, andmixing of the ingredient sub stances.

Concrete is very widely used as a foundation or base tain extent alsobecause of its relatively low price at least in relation to othercomparable building materials. These properties of concrete andparticularly its strength, however, depend largely on the weight ratiobetween the ingredient, substances in the concrete being accurate inaccordance with the mixing prescription. This requirement appliesparticularly to the weight ratio between water and cement, the so-calledwater-cement factor, which is of greatest importance for the strength ofthe concrete and for obtaining a concrete mass of high quality. Suchconcrete masses of high quality could heretofore be produced in arational manner only in large stationary plants, so-called concretefactories, from which the concrete is delivered in ready state to thedifferent building sites. Such permanent concrete factories usually arelocated only near densely populated areas and can service building siteslocated within a distance which from a transportation aspect iseconomically profitable and justifiable. At other building sites, i.e.,such which are located at too large distances from a concrete factory torender the transport of the concrete economically profitable, theconcrete usually is produced in so-called concrete mixers whichsubstantially comprise a rotary container with emptying means. Theseconcrete mixers have the advantage of being easily movable from onebuilding site to the other, but theyhave such a small volume thatseveral differentbatches have to be prepared even for a relatively smallfloor in a house structure. As these concrete mixers are chargedmanually, the probability is very small that each batch is given thequality intended, and that the different batches are given a uniformquality. Concrete mixers of this kind, therefore, cannot be used whenthe concrete has to meet very high requirements and when largequantities of concrete are required. Building sites located at a largedistance from the nearest concrete factory and requiring largequantities of high-grade concrete, for example for large damconstructions, power stations and the like, either are to be suppliedwith concrete from the nearest concrete factory or aconcrete factory isto be erected at the building site in'question which after completedwork normally is to'bedismantled. Of these two alternatives usually ischosen that which is economically most profitable, but also thisalternative involves large costs and renders the building worksubstantially more expensive.

The present invention has, therefore, as its object to produce aconcretestation which shows the advantages of the small concrete mixer withrespect to movability and the advantages of the fully automaticpermanent concrete factory with respect to the production of highgradeconcrete in large quantities at lowest possible cost, which quickly canbe erected without concrete foundation and mobile cranes, with the helponly of such vehicles which always operate on building sites of the typein question, such as for example mechanical loaders of the type rearloader and the like, and which can be transported on road or on rail.This object is achieved in that the invention has been given thecharacterizing features defined in the claims.

The invention is described in greater detail in the following, withreference to the accompanying drawings, in which FIG. 1 is a plan viewof an embodiment by way of example of the concrete station according tothe invention erected for operation at the site and comprising fivedifferent basic units,

FIG. 2 is'a lateral view of the concrete station shown in FIG. 1,

FIGS. 3 and 4 are a plan view and, respectively, a lateral view of thefirst unit comprised in the concrete station, viz, a weighing unit foraggregates and cement,

FIG. 5 is a section through this first unit substantially along the lineVV in FIG. 4,

FIG. 6 is a lateral view of the second unit comprised in the concretestation, viz, a cement storing or silo unit in transport position,

FIG. 7 shows this second unit in operating position or in the positionshown in FIGS. 1 and 2,

FIG. 8 is a plan view of the third unit comprised in the concretestation, viz, a conveying unit,

FIG. 9 shows this third unit in a lateral view and in operating positionor in the position shown in FIG. 2, the transport position being markedschematically by dash-lines,

FIG. 10 shows a detail of the conveying unit, more precisely a means forfeeding cement from a cement scale vessel and admixing this cement tothe aggregate material on the conveyor,

FIG. 11 is a lateral view of the fourth unit comprised in the concretestation, viz, a concrete mixer unit in transport position,

FIG. 12 shows this fourth unit in operating position, i.e., in theposition shown in FIG. 2, and

FIGS. 13 and 14, finally, are a lateral view and, respectively, a viewseen from above in section of the fifth unit comprised in the concretestation, viz, a control unit.

The embodiment of the mobile concrete station ac- I cording to theinvention, as shown in the drawings, comprises five different unitsdesignated generally by 1, 2, 3, 4 and 5 and defined in the same orderas aggregate and cement weighing unit, cement storing or silo unit,conveying unit, concrete mixer unit-and control unit, which latter unithowever is not absolutely necessary as it may advantageously be builtin.in any of the other units. In addition to said units there is provided ahydraulic unit, though not shown in the drawings, which comprises anelectromotor, a pump, an oil tank containing all oil required forcontrolling the movement of the different units from transport positionto operating position, two manuallyoperated four-way valves and oilpressure hoses with quick-couplings for connecting if necessary thehydraulic unit to anyone of the different units. If the concrete stationis intended for operation in areas where there is risk of freezing, theconcrete station also may include a unit comprising a boiler of optionaltype mounted in an insulated carriage with a hot-water tank, pump andoil tank containing fuel oil for firing the boiler.

According to the invention each unit comprised in the concrete stationis built up upon a carriage provided with a detachable wheel equipment,so that each unit individually, or coupled in pairs or more units, canbe pulled or pushed by a traction vehicle of truck, tractor or similartype. The wheel equipment for each such carriage is such that it can beused for anyone of the units comprised in the concrete unit, with theexception however of the control unit 5 (FIGS. 13 and 14) whichpreferably is of conventional caravan type comprising an insulatedcontrol room 6 provided with radiators, in which room a control table 7with weighing and measuring instruments, control levers and flow sheet,and the electric center with fuses and motor switches are arranged. Saidcarriage is provided on its outside with connections 9 under roofprotection for the connection of the ingoing and outgoing lines from andto the different units and of the mains voltage.

The first one of the different units to be comprised in the concretestation according to the invention is, as mentioned above, the aggregateand cement weighing unit designated by 1 in FIGS. 1 and 2 which is shownin greater detail in FIGS. 3 to 5. This unit, like the other ones, isbuilt up on a carriage 10 provided with four wheels 11 of which each canbe detached in a simple way by drawing the wheel axle out of its bearingbushing, and with a pull rod 12 which together with the front wheel pairis pivotally supported at the carriage for steering the same. Thecarriage further is provided with built-in jacks indicated schematicallyat 13. By means of said jacks and of trestles 14 adapted for directplacement on the ground, the carriage can be lifted rapidly off theground and be blocked up to a level with the wheels freely suspended orremoved.

The carriage 10 is provided with two relatively thick sides 15, abovewhich a number of bins 16 for aggregate material are detachablyarranged. The bins are filled with aggregate material preferably directfrom a truck which, however, presupposes an arrangement of ramps, orwith the help of a loader which usually always is available on workingsites of the type here concerned. The aggregate bins are emptied bymeans of double sector covers 17, which are operated by compressed aircylinders 18 controlled by solenoid valves of the four-way type andlimit switches for indication and fine feeding, onto a weighing conveyor19 located below the bins and between the sides of the carriage. Saidconveyor 19 is provided with weighing troughs 20 having Z-shaped sideswith double sealings to prevent the loss of weighed aggregate materialduring its transport on the weighing conveyor out of the aggregate andcement weighing unit 1. The weighing conveyor is suspended at theaggregate bins by means of chains, shroud screws and electronic weighingtransmitters. These details are only schematically shown and designatedgenerally by 21 in FIGS. 3-5. When the weighing conveyor has received'the aggregate amount determined in accordance with the mixingprescription, this is recorded by the weighing transmitters, and thecovers of the aggregate bins are closed manually or automatically whilethe weighing conveyor is started for unloading the weighed aggregatematerial.

On said carriage, in the discharge direction after the aggregate bins16, there is further provided a cement weighing vessel 22 which like theweighing conveyor is suspended by means of chains, shroud screws andweighing transmitters at a pair of arms 23 projecting from the carriage.In the drawings said vessel is shown with a single cement intake 24 forcharging cement from above, but, in other embodiments it may be providedwith, for example, four separate intakes for charging cement from abovefrom more than one cement storing container or silo at a time, and hasan outlet 25 provided with a sliding damper which is operated by acompressed air cylinder controlled by a solenoid valve of the four-waytype. When the cement weighing vessel 22 has received the cement amountdetermined in accordance with the mixing prescription used, this isrecorded by the weighing transmitters which cause the supply of cementto be stopped automatically and the sliding damper to be opened withdelay relative to the aggregate feed so that the weighed cement materialcan flow out of the vessel.

Below this outlet 25 and in connection to the discharge end of theweighing conveyor, a conveying belt 26 is provided which is included inthe belt conveyor unit 3. Said conveyor unit, which is shown in greaterdetail in FIGS. 8 and 9, comprises a belt conveyor 29 of conventionaltype hingedly connected with a carriage 28 located below the beltconveyor, and is provided with two wheels 27 of the same type as at theaggregate and cement weighing unit 1, so that the wheels of one unit canbe used in the other unit, and vice versa. Said carriage 28 also isprovided with built-in jacks 30 by means of which in cooperation withthe trestles 14 adapted for direct placement on the ground, the conveyorunit 3 can be blocked up to operating position in which the beltconveyor 3 is to align with the aggregate and cement weighing unit 1,and its end facing said unit is to be located in a plane below thedischarge end of the weighing conveyor 19 so that the aggregate materialdischarged from the aggregate and cement weighing unit falls onto theconveying belt of the belt conveyor 3. The arrangement of the beltconveyor end facing the aggregate and cement weighing unit below thedischarge end of the weighing conveyor preferably is brought about byexcavating a hole in the ground possibly by means of a loader ofconventional type.

Between the belt conveyor 29 proper and the carriage 28 a number oftelescopic hydraulic cylinders 31 are provided by means of which thebelt conveyor is pivoted upwards from the transport position shown bydash-lines in FIG. 9 to the operating position shown by fully drawnlines after the carriage has been blocked up in the manner described.This unit 3 is further provided with a special loading box 32 for cementmaterial which in operating position of the unit is located directlybelow the outlet 25 of the cement scale vessel 22. Said loading box, asappears more clearly from FIG. 10, has the form of a funnel with anobliquely cut discharge opening 33 directed in the feed direction of theconveying belt 26. In front of this opening and directly above theconveying belt 26, a plough-shaped body 34 is provided which has a lowersurface 35 extending substantially in parallel with the conveying belt,and parallel wings 36 extending past said discharge opening 33. Theobject of said body is to plough the cement down into the aggregatematerial in order to prevent dust development and loss of material. Thebelt conveyor 29 further should be provided with a roof-superstructure37 to protect the conveyed material against rain, wind etc., as shownspecially in FIG. 10.

Cement is supplied to the cement scale vessel 22 via a conveying orcement screw 38 from the cement storing or silo unit designated by 2 inFIGS. 1 and 2 and shown in greater detail in FIGS. 6 and 7. Said unitcomprises substantially a silo 39 provided'with a ladder 40. Intransport position, i.e., in the position shown in FIG. 6, the silo issupported on a rear carriage 41 and a front carriage 42 with pull rod 43which together with the wheels 44 of the front carriage is pivotallymounted to render possible its steering. The wheels 44 of the frontcarriage and also the wheels 44 of the rear carriage are of the sametype as in the two aforementioned units 1 and 3. The rear carriage 41comprises a rectangular underframe 45 which adjacent its corners isprovided with built-in jacks 46 by means of which and of the trestles 14adapted for placement directly on the ground said unit 2 can be blockedup, and with four inclined stay members 47 preferably stayed diagonallyof which the rear members are hingedly connected with the silo by meansof studs 48 arranged in bushings in the stay members 47 and in the sidesurface of the silo. The front stay members 47 are also connected withthe silo by means of studs 49 which are removably arranged in bushingsin the stay members 47 and in the silo side surface. The silo isprovided, in addition to said bushings, with two further bushings whichare arranged diametrically and designated by 50 in FIG. 6. The silo,thus, is supported in transport position on the front carriage 42 whichis detachable, and on the rear carriage 41 which is connected with thesilo only by said studs.

The rear carriage 41 is further provided with two telescopic hydrauliccylinders 51 which are hingedly mounted on the underframe and on thelower surface of the silo on both sides of the funnel-shaped emptyingneck 52. The forward studs 49 having been removed and possibly also thefront carriage which, however, can remain in place, the silo can bymeans of said hydraulic cylinders be folded upwards about the swing axleformed by the rear studs 48, from the transport position shown in FIG. 6to operating position shown in FIG. 7, in which position the removedstuds 49 are inserted into the bushings of the stay members and into thebushings 50 on the silo proper, so that the silo is locked in itsfolded-up or operating position. After the silo has been erected tooperating position, it is filled with cement through a charging pipe 53,and the cement screw 38 is mounted in place for transferring cement fromthe silo to the cement scale vessel 22. The silo should further comprisea dust-collecting filter and a capacitive level indicator.

The concrete station according tothe invention may include more than onecement silo unit 2, though this is not shown in the drawings, and atmaximum as many as there are charging apertures 24 in the cement scalevessel 22. In the latter case, i.e., with four cement silo units, theunits should be arranged in a fan shaped pattern on both sides of thebelt conveyor unit 3.

The concrete station according to the invention includes further, asmentioned, a concrete mixer unit 4 which is located after the beltconveyor unit 3 and shown in greater detail in FIGS. 11 and 12. Saidunit comprises a conventional concrete mixer 54 of some suitable makewhich is mounted on a foundation 55. The foundation for the concretemixer 54 is supported on a rear carriage 56 and a front carriage 5.7which are provided with two detachable wheels 58 each being of the sametype as the wheels for the other units 1, 2 and 3 comprised in theconcrete station. The front carriage 57 is further provided with a pullrod 59 placed between the wheels and adapted to be detached like thewheels and together with the wheels be pivoted for steering the unit. Inthe position shown in FIG. 11, the transport position, the rear carriage56 as well as the front carriage 57 are in a substantially horizontalposition and by means of a number of studs 60, 61, for example threestuds on each side, fixed and locked in this position relative to thefoundation 55. Between each carriage 56, 5'7 and the foundation 55 anumber of telescopic hydraulic cylinders 62 are hinged, which are onlyschematically indicated in FIGS. 11 and 12. By means of these hydrauliccylinders the front carriage and the rear carriage rolling on therespective wheels can after the studs 61 have been removed, be pivotedabout the studs 60 arranged on both sides and up into the operatingposition shown in FIG. 12, in which the carriages 56, 57 which in thisposition act as legs for the foundation 55 are locked by means of thestuds 61. Thereafter the unit is blocked up by help of jacks 63 builtinin each carriage and of the trestles 14. In this position, the operatingposition, the foundation 55 should have been lifted up to such a levelthat a truck, tractor or another loading vehicle can be driven below thefoundation and there receive the prepared concrete from the concretemixer 54 which in a conventional manner is provided with a dischargefunnel 65. This unit further should comprise a pressurized water tank 64and necessary measuring equipment to render possible an automatic mixingprocess and measuring equipment for receiving the material fed by theconveying unit 3, as well as means for adding the determined wateramount tothe material charged into the mixer.

As is evident from the aforesaid, each unit comprised in the mobile ormovable concrete station according to the invention is mounted on acarriage, so that the units without difficulty can be individuallypulled by a truck or be transported by railway from one working site toanother. At the arrival to a new working site, in order to position theconcrete station as rapidly as possible the units according to theembodiment shown in the drawings with a separate control. car 5 shouldcome in the order as follows: concrete mixer unit 4, belt conveyor unit3, cement silo unit 2 and aggregate and cement weighing unit 1. Thecontrol unit or car 5 need not come in before or after some specialunit. This applies to some extent also to the cement silo unit or units,particularly if there is plenty of space, but it should be insertedafter the belt conveyor unit 3.

At first, th concrete mixer unit 4 is driven or backed to the intendedplace of erection. The hydraulic unit for control of the hydrauliccylinders included in the different units should accompany this unit orcome in after it so that the hydraulic unit can be connected immediatelyfor lifting the concrete mixer unit 4 to operating position in which themixer is blocked up by means of the jacks and four trestles. During thistime the belt conveyor unit 3 is moved in and aligned with unit 4 andblocked up. Thereafter the hydraulic unit is switched in for lifting thebelt conveyor into operating position in which this unit is pushed overthe charging funnel 65 of the concrete mixer 54. At this stage thecontrol unit 5' can have been blocked up, so that the work of switchingin and connecting the different lines can be commenced. When the beltconveyor unit 3 is in place, preferably the cement silo unit 2 ispositioned because its position in relation to the units already blockedup is determined by the loading box 32 on the unit 3. After itsblocking-up, the hydraulic unit can be connected to the telescopichydraulic cylinders 51 of the unit 2 for folding the silo 39 properupwards into operating position in which it is locked in the mannerdescribed. Thereafter the aggregate and cement weighing unit is insertedso as to align with the units 3 and 4 and so that the cement scalevessel 22 is situated directly above the loading box 32 of the conveyor3 and now this unit 1 can be blocked up. After the cement screw 38 hasbeen mounted in its place between the silo 39 and the cement scalevessel 22, the weighing conveyor has been released from its lockedposition, and all lines have been switched in and connected, theconcrete station is ready for operation. Before that, of course, thesilo 39 must have been filled with cement and the bins 16 been filledwith aggregate.

The present invention is not restricted to what is described above andshown in the drawings, but can be modified in many different ways withinthe scope of the claims.

What we claim is:

1. A mobile or movable concrete station which is composed of severalseparate interconnectable units performing the functions required formixing highgrade concrete including the weighing and charging ofaggregate material and cement, the addition of water in a proportiondetermined by the mixing prescription being used, and the mixing of theingredient substances, said mobile station comprising as separate unitsat least one aggregate weighing unit, at least one cement silo unit, abelt conveyor unit, and a concrete mixer unit; said aggregate weighingunit including a cement scale vessel disposed adjacent the discharge endof said aggregate weighing unit for adding weighed cement to theaggregate material at the starting end of said conveyor unit; saidconveyor unit being adapted to connect said aggregate weighing unit withsaid concrete mixer unit; each of said separate units being mounted onat least one wheeled carriage so that each unit individually or coupledin pairs can be transported by means of a traction vehicle or byrailway; at least the cement silo unit, the belt conveyor unit, and theconcrete mixer unit being provided with telescopic hydraulic cylindersadapted to move each said unit from a transport position into anoperating position; the silo portion of said cement silo unit resting inits transport position on a front carriage to which it is detachablyconnected and on a rear carriage to which it is connected by means ofstuds which form a swing axle about which said silo portion can beerected by means of said hydraulic cylinders from its transport positioninto its operating position; said concrete mixer unit comprising afoundation connected to both a front carriage and a rear carriage eachof said mixer unit carriages being hingedly connected to said foundationat one end thereof and having wheels at its other end, the hydrauliccylinders for moving the mixer unit from its transport position to itsoperating position being arranged between said foundation and saidcarriages and being operative, when actuated, to cause the mixer unitcarriages to move from a substantially horizontal trans port position toa raised operating position by a rolling of the carriage wheels aboutthe respective hinged connections between said carriages and saidfoundation.

2. A mobile or movable concrete station which is composed of a pluralityof separate interconnectable units performing the functions required formixing high-grade concrete including the weighing and charging ofaggregate material and cement, the addition of water in a proportiondetermined by the mixing prescription being used, and the mixing of theingredient substances, said mobile station comprising as separate unitsat least one aggregate weighing unit, at least one cement silo unit, abelt conveyor unit, and a concrete mixer unit; said aggregate weighingunit including a cement scale vessel positioned adjacent the dischargeend of said aggregate weighing unit for adding weighed cement to theaggregate material at the starting end of said conveyor unit; saidconveyor unit being adapted to connect said aggregate weighing unit withsaid concrete mixer unit, the starting end of said conveyor unit facingsaid aggregate weighing unit and being provided with a loading box forreceiving cement from said cement silo unit, said loading box beingprovided with a plough-shaped body for ploughing cement down into theaggregate material on said conveyor unit; each of said separate unitsbeing mounted on at least one wheeled carriage so that each unitindividually or coupled in pairs can be transported from one location toanother by means of a traction vehicle or by railway.

3. A mobile concrete station comprising a plurality of separateinterconnectable units performing the functions required for mixinghigh-grade concrete, including the weighing and charging of aggregatematerial and cement, the addition of water in a proportion determined bythe mixing prescription being used, and the mixing of the ingredientsubstances, said mobile station including at least one separateaggregate weighing unit having a plurality of bins for storing differentsized aggregates, said bins being located above a weighing conveyorcomprising a portion of said aggregate weighing unit and operative toweigh and charge the aggregates being weighed, said mobile stationfurther including at least one separate cement silo unit, a separatebelt conveyor unit, and a separate concrete mixer unit; each of saidfour separate units being mounted on at least one wheeled carriage toenable said carriage mounted units to be transported individually or inan interconnected relationship from one location to another; each ofsaid units being provided with lifting means for lifting and blocking upsaid unit on ground supported trestles; said belt conveyor unit beingdisposed between said aggregate weighing unit and said concrete mixerunit in alignment therewith, said cement silo unit being disposed to theside of the aligned aggregate weighing and belt conveyor units and beingconnected, by means of a cement screw, to a cement scale vesselpositioned adjacent the discharge end of said aggregate weighing unit,said cement scale vessel being operative to weigh cement from cementsilo unit and to supply the cement so weighed to said aggregates at thestarting end of said belt conveyor unit for delivery by said beltconveyor unit to said mixer unit.

4. The concrete station of claim 3 wherein said lifting means comprisejacks mounted on each one of said wheeled carriages.

5. The concrete station of claim 3 wherein said cement scale vessel issuspended from the rear end of said aggregate weighing unit.

6. The concrete station of claim 3 wherein at least said cement silounit, said belt conveyor unit, and said concrete mixer unit are eachprovided with telescopic hydraulic cylinders for shifting said unitsfrom a transport position into an operating position.

7. The concrete station of claim 6 wherein the silo portion of saidcement silo unit rests in its transport position on a front carriage towhich it is detachably connected, and on a rear carriage to which it isconnected by means of studs, at least some of said studs forming a swingaxle about which said silo portion can be erected by means of saidhydraulic cylinders from a generally horizontal transport position intoa generally vertical operating position.

8. The concrete station of claim 6 wherein said concrete mixer unitincludes a foundation for supporting the concrete mixer, said mixer unitfurther including a front carriage and a rear carriage each of which ishingedly connected to said foundation at one end of the carriage andeach of which carries wheels at its other end, said hydraulic cylindersfor moving the mixer unit from its transport position to its operatingposition being located between said foundation and said carriages andbeing operative to cause the carriages to roll between a substantiallyhorizontal transport position and a raised operating position.

9. The concrete station of claim 3 wherein said belt conveyor unit,adjacent the end thereof facing the aggregate weighing unit, is providedwith a loading box for receiving cement from the cement silo unit, saidloading box being disposed below the cement silo unit and being providedwith a plough-shaped body for ploughing cement down into the aggregatematerial on said conveyor unit 10. The concrete station of claim 3further comprising a wheeled control car equipped with a control tableand with an electrical center, and means for connecting said car to eachof said units for controlling the different functions of said units fromsaid control car.

1. A mobile or movable concrete station which is composed of severalseparate interconnectable units performing the functions required formixing high-grade concrete including the weighing and charging ofaggregate material and cement, the addition of water in a proportiondetermined by the mixing prescription being used, and the mixing of theingredient substances, said mobile station comprising as separate unitsat least one aggregate weighing Unit, at least one cement silo unit, abelt conveyor unit, and a concrete mixer unit; said aggregate weighingunit including a cement scale vessel disposed adjacent the discharge endof said aggregate weighing unit for adding weighed cement to theaggregate material at the starting end of said conveyor unit; saidconveyor unit being adapted to connect said aggregate weighing unit withsaid concrete mixer unit; each of said separate units being mounted onat least one wheeled carriage so that each unit individually or coupledin pairs can be transported by means of a traction vehicle or byrailway; at least the cement silo unit, the belt conveyor unit, and theconcrete mixer unit being provided with telescopic hydraulic cylindersadapted to move each said unit from a transport position into anoperating position; the silo portion of said cement silo unit resting inits transport position on a front carriage to which it is detachablyconnected and on a rear carriage to which it is connected by means ofstuds which form a swing axle about which said silo portion can beerected by means of said hydraulic cylinders from its transport positioninto its operating position; said concrete mixer unit comprising afoundation connected to both a front carriage and a rear carriage eachof said mixer unit carriages being hingedly connected to said foundationat one end thereof and having wheels at its other end, the hydrauliccylinders for moving the mixer unit from its transport position to itsoperating position being arranged between said foundation and saidcarriages and being operative, when actuated, to cause the mixer unitcarriages to move from a substantially horizontal transport position toa raised operating position by a rolling of the carriage wheels aboutthe respective hinged connections between said carriages and saidfoundation.
 2. A mobile or movable concrete station which is composed ofa plurality of separate interconnectable units performing the functionsrequired for mixing high-grade concrete including the weighing andcharging of aggregate material and cement, the addition of water in aproportion determined by the mixing prescription being used, and themixing of the ingredient substances, said mobile station comprising asseparate units at least one aggregate weighing unit, at least one cementsilo unit, a belt conveyor unit, and a concrete mixer unit; saidaggregate weighing unit including a cement scale vessel positionedadjacent the discharge end of said aggregate weighing unit for addingweighed cement to the aggregate material at the starting end of saidconveyor unit; said conveyor unit being adapted to connect saidaggregate weighing unit with said concrete mixer unit, the starting endof said conveyor unit facing said aggregate weighing unit and beingprovided with a loading box for receiving cement from said cement silounit, said loading box being provided with a plough-shaped body forploughing cement down into the aggregate material on said conveyor unit;each of said separate units being mounted on at least one wheeledcarriage so that each unit individually or coupled in pairs can betransported from one location to another by means of a traction vehicleor by railway.
 3. A mobile concrete station comprising a plurality ofseparate interconnectable units performing the functions required formixing high-grade concrete, including the weighing and charging ofaggregate material and cement, the addition of water in a proportiondetermined by the mixing prescription being used, and the mixing of theingredient substances, said mobile station including at least oneseparate aggregate weighing unit having a plurality of bins for storingdifferent sized aggregates, said bins being located above a weighingconveyor comprising a portion of said aggregate weighing unit andoperative to weigh and charge the aggregates being weighed, said mobilestation further including at least one separate cement silo unit, aseparate belt conveyor unit, and a separate concreTe mixer unit; each ofsaid four separate units being mounted on at least one wheeled carriageto enable said carriage mounted units to be transported individually orin an interconnected relationship from one location to another; each ofsaid units being provided with lifting means for lifting and blocking upsaid unit on ground supported trestles; said belt conveyor unit beingdisposed between said aggregate weighing unit and said concrete mixerunit in alignment therewith, said cement silo unit being disposed to theside of the aligned aggregate weighing and belt conveyor units and beingconnected, by means of a cement screw, to a cement scale vesselpositioned adjacent the discharge end of said aggregate weighing unit,said cement scale vessel being operative to weigh cement from cementsilo unit and to supply the cement so weighed to said aggregates at thestarting end of said belt conveyor unit for delivery by said beltconveyor unit to said mixer unit.
 4. The concrete station of claim 3wherein said lifting means comprise jacks mounted on each one of saidwheeled carriages.
 5. The concrete station of claim 3 wherein saidcement scale vessel is suspended from the rear end of said aggregateweighing unit.
 6. The concrete station of claim 3 wherein at least saidcement silo unit, said belt conveyor unit, and said concrete mixer unitare each provided with telescopic hydraulic cylinders for shifting saidunits from a transport position into an operating position.
 7. Theconcrete station of claim 6 wherein the silo portion of said cement silounit rests in its transport position on a front carriage to which it isdetachably connected, and on a rear carriage to which it is connected bymeans of studs, at least some of said studs forming a swing axle aboutwhich said silo portion can be erected by means of said hydrauliccylinders from a generally horizontal transport position into agenerally vertical operating position.
 8. The concrete station of claim6 wherein said concrete mixer unit includes a foundation for supportingthe concrete mixer, said mixer unit further including a front carriageand a rear carriage each of which is hingedly connected to saidfoundation at one end of the carriage and each of which carries wheelsat its other end, said hydraulic cylinders for moving the mixer unitfrom its transport position to its operating position being locatedbetween said foundation and said carriages and being operative to causethe carriages to roll between a substantially horizontal transportposition and a raised operating position.
 9. The concrete station ofclaim 3 wherein said belt conveyor unit, adjacent the end thereof facingthe aggregate weighing unit, is provided with a loading box forreceiving cement from the cement silo unit, said loading box beingdisposed below the cement silo unit and being provided with aplough-shaped body for ploughing cement down into the aggregate materialon said conveyor unit.
 10. The concrete station of claim 3 furthercomprising a wheeled control car equipped with a control table and withan electrical center, and means for connecting said car to each of saidunits for controlling the different functions of said units from saidcontrol car.